ANSI 1 B1.20.1 General Purpose Pipe Threads
8.2 ADVANCE PLANNING AND PREPARATION
1. An assessment of the well control equipment perfor- mance curve as discussed in Appendix A—Shallow Gas Well Control.
2. Ensuring crew members are familiar with the equip- ment and its proper testing, maintenance, and operation.
Installation, operation, and maintenance manuals pro- vided by the manufacturer should be available on the rig.
3. Procedures to ensure diverter line is clear of obstruc- tions at all times.
4. If a BOP stack is in use, the position (open or closed) of the kill and choke fail-safe valves in relation to the choke manifold should be pre-planned.
5. Depending on the type power plant(s) on the rig, engine and generator assignments should be pre-planned for use during divert operations.
6. Engine spark arrestors should be in good working order and electrical equipment locations should conform to API RP 500, RP 505 or applicable mobile operating drilling unit classification standards.
7. In case a decision is made to leave the location, emer- gency meeting points for employees should be planned.
For marine operations, windlasses/winches should be setup to pay out leeward mooring lines without power either by release of chain stoppers/locking pawl or release of the band/motor brakes. Consideration may be given to moving crosswind if a strong wind prevails.
Figure 7.1—Example Floating Drilling Vessel Diverter and Riser System Installed on Structural Casing Housing
Diverter Upper flex/ball joint
(optional)
Drill floor Vent line Flow line
Hydraulically or pneumatically operated valves
Hydraulically or pneumatically operated valves Riser tensioner line(s) Guideline(s)
Inner barrel Outer barrel
Telescopic (slip) joint
}
Section A-A' (Optional arrangement) Structural casing housing
Seafloor mudline
Structural casing shoe Guide base
Marine riser
Pressure equalization (dump or drilling fluid discharge valve (optional)
Lower flex/ball joint Connector Support ring Telescopic (slip) joint packer
A
A'
26 API RECOMMENDED PRACTICE 64
Figure 7.2—Example Floating Drilling Vessel Diverter with Riser and BOP System Being Lowered
Diverter Upper flex/ball joint
(optional)
Drill floor Vent line Flow line
Hydraulically or pneumatically operated valves
Riser tensioner line(s) Guideline(s)
Inner barrel Outer barrel
Telescopic (slip) joint
}
Marine riser
Bop stack Lower flex/ball joint
Support ring Telescopic (slip) joint packer
A
A'
Hydraulically or pneumatically operated valves
Section A-A' (Optional arrangement)
Seafloor mudline
Structural casing shoe Guide base
Conductor casing wellhead Pressure equalization (dump or drilling fluid discharge) valve (optional)
Figure 7.3—Example Diverter System Schematic (Flow Line above Vent Lines)
Figure 7.4—Example Diverter System Schematic (Flow Line In-line with Vent Lines)
Hydraulically or pneumatically operated valve (normally open)
Flex/ball joint
Telescopic (slip) joint Diverter/annular preventer Flow
line
Vent line
Vent line Hydraulically or
pneumatically operated valves
Flex/ball joint
Telescopic (slip) joint Diverter/
annular preventer
Flow line to shale shaker
Vent line
A A'
Hydraulically or pneumatically operated valves
Section A-A'
28 API RECOMMENDED PRACTICE 64
Figure 7.5—Example Diverter System Schematic (Flow Line Discharge above Vent Discharge Line(s) but Vent Line(s) Extended above Flow Line)
Hydraulically or pneumatically operated valve (normally open) Hydraulically or pneumatically
operated valve (normally open)
Flex/ball joint
Telescopic (slip) joint Diverter/annular preventer
Vent line
Long radius bends Long radius
bends
Flow line Hydraulically or
pneumatically operated valve Vent line
Diverter Lines Extend Fore and Aft
Diverter Lines Extend to Port and Starboard
Figure 7.6—Example Diverter Line Schematics for Conventionally Moored Drillships
Vent line Vent line
Targeted tee
Hydraulically or pneumatically operated valves
Vent line
Vent line Hydraulically or
pneumatically operated valves
30 API RECOMMENDED PRACTICE 64
Diverter Lines Extend to Port and Starboard
Figure 7.7—Example Diverter Line Schematics for Conventionally Moored Semisubmersibles
Vent line Vent line
Hydraulically or pneumatically operated valves
Vent line
Vent line Hydraulically or
pneumatically operated valves
Drillships
Semisubmersibles
Figure 7.8—Example Diverter Line Schematics for Dynamically Positioned Vessels
Vent line
Hydraulically or pneumatically operated valves
Hydraulically or pneumatically operated valves Vent line
Vent line
Bow Stern
32 API RECOMMENDED PRACTICE 64
8. If the vessel propulsion system is to be used to move the rig off location, the system should be in an operational mode and require no start-up or warm-up time.
9. If a marine riser is in use, sufficient riser tension should be available to lift the lower marine riser package clear of the BOP stack in the event of an emergency disconnect.
10. The marine riser spider and proper diverter and riser handling tools should be available near the drill floor.
11. Procedures for welding or operations involving open flames.